auto save

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
-file1=open(r'E:\book.txt','w',encoding='utf-8')
-file1.write('小兰：12本')
-file1.close()
\ No newline at end of file
+# with open(r'E:\book.txt','a',encoding='utf-8') as file1:
+#     file1.write('小强：15本\n')
+#     file1.write('小李：14本\n')
+new_data=""
+with open(r'E:\book.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强：11本' in data:
+            data = data.replace('小强：11本','小强：15本')
+        if "小兰：17本" in data:
+            data = data.replace("小兰：17本","小兰：14本")
+        new_data=new_data + data
+with open(r'E:\book.txt','w',encoding='utf-8') as file1:
+    file1.write(new_data)
\ No newline at end of file